Monday, April 4, 2011

HOW TO SOLVE MULTIPLE CHOICE QUESTIONS IN IIT-JEE? (part-2)

First of all, i'd like to apologize to all those who managed to read the part-1 and "actually" waited for part-2. On my part, i can only say that i was quite busy with my life in IIT. Well, without wasting any further time in discussing crap things, let's come straight to the point. So, we were done with 7 shortcuts, here are the remaining few which i remember-

8) Find for n-terms: There are perhaps the easiest kind of questions in maths. Generally, the nth term or sum or product of n-terms is asked. What you can simply do is put the value of n=1,2,3 in the given options and compare with what value will come for 1,2 or 3 terms by simple calculation. Mostly, the answer comes with n=1 or 2. The maximum number of trials required in such questions is 3. If it goes beyond 3, then the question is a high level one and it's better to leave it alone. Example: Sum of n natural numbers (1+2+3+....+n) is(a) n(n-1)/2; (b) n(n+1)/2; (c) n(n+2)/3; (d) (n+1)(n-1);
Here, the sum of 1 natural number is 1. Now, if you put n=1 in the options, we get;(a)=0; (b)=1; (c)=1; (d)=0; Hence, options (a) and (d) can be ruled out. For n=2, the actual answer is (1+2=3). On putting n=2, we get (b)=3; (c)=8/3. Hence, only option-(b) is the correct answer. Similarly, with some practice, you can easily learn how to apply this kind of logic in questions.

9) Generalize the question: This is one of those favorite derivation types questions given in JEE. They will give you a complex orientation and ask you to find one of the variable.what you have to do is assume an orientation such that two or more of the arbitary values go to zero/one/some easy value and then check the options again. Example: suppose for positive real values, it is given that :m3x4=n3y4 and m2<n2,then

(a) m3x2>n3y2 ; (b) m3<y4 ; (c) m3x2<n3y2 ; (d) m3>y4

Now, if you actually start doing the maths of it, you will find yourself in a trouble of inequalities. So better think of an alternative. As we are given necessary conditions for with m and n, so lets assume m=2;x=3;n=3. Thus, you will get y as fourth root of 24which you can approximate as square root of 5(coz 5x5=25). Now root of 5 is 2.2. For these questions you have to be good at approximating values which is not a big ask (atleast its more natural than remembering all identities). Now put these values in the options. You will easily see that on cancelling the "3" in the options wherever possible, the only option that still stands as correct is option (b) which is the answer.
Similarly, in questions where you are given random inclinations of plane (alpha,beta,etc), see what will happen if the inclination was zero/90. Now put alpha/beta/whatever equal to zero or 90 in the answer and see which of them satisfies the condition. Similarly, for finding moment of inertia about a random axis, same can be appllied.Try this one yourself. Example: Find M.O.I of a rod along an axis at theta degrees from its length passing through the centre.

SOLUTION: Here, we clearly know that M.O.I of a rod along its length is zero. So at Ө=0; M.O.I=0. On putting Ө=0 in options, (a),(c) and (d) become zero. Also M.O.I of a rod perpendicular to its axis i.e. Ө=90 is ML2/12. Now, on putting Ө=90, only option(a) gives ML2/12. Rest all become zero. Simple!! Isn't it??

10) Modern Physics (atom,nuclei,radiation,etc): Now this is one topic you would not want to lose marks on. This topic accounts for roughly 20-25 marks in IIT-JEE and you won't need more than a day to expertise this topic even if you start from scratch. If you can't expertise, atleast cram all the formulae related to modern physics. YOU SIMPLY CAN'T LET THE QUESTIONS FROM THIS TOPIC GO AWAY FROM YOU.If you atleast remember all the formulae, you can devise something even in the exam ahll to find the correct option but please DON'T LEAVE IT. Its study requires less than one-tenth of the time required to study "Mechanics" and still it provides marks- 10 times than "Mechanics". STRANGE BUT TRUE!

11) Co-ordinate geometry: This is one area where even a raw but approximate diagram may work in some questions of finding radius, area, equations,etc. Simply draw a diagram according to scale and try to find the required thing. It may seem trivial but it works in many situations. What's the hesitaion in trying something to get to the answer when you don't know the concept? :-p

12) Kinematics, trigonometry: These are the two least weightage topics in JEE. Try to do them as late as possible. It won't even hurt if you leave these topics. They are meant to take up huge volumes of your time and have maximum 2-3 questions in JEE. In the same amount of time, you can score 20-25 marks by studying other topics. YES! IT-IS-TRUE! One may argue that trigonometric basics are used at lots of places elsewhere. My answer is that what you know about trigonometry, by default, is enough to solve the main questions. The tricky ones require use of some identity which only the geekiest of nerds will have idea about. So its better off to leave these topics and concentrate on other areas.

13) Chapter-1 (physics): Remember it? When you enter 11th standard, you have the first chapter about measurements and all which no one cares about. I don't know why no coaching institute pays importance to it. But, this chapter is one easy piece of cherry. Read it thoroughly. You get 3 questions from it about dimensions,maximum error and approximation. If you are not able to understand it from the book, read all the questions from your study material about it. On looking up the answer key, you yourself will eventually figure out the ways to get to the answer of these problems. Remember, on the answer-sheet, only the answer is important. No one cares about the way to get to it. This chapter is just freely distributed marks.

14) NCERT is GOD/GITA/QURAN/BIBLE/WHATEVER:Even my teachers used to say the same when i was in 12th and even i never paid attention to it. But, today i know they said the truth. NCERT is the most precise book esp. in case of CHEMISTRY. In physics and maths, you may find deviations but every question of Chemistry in IIT-JEE is taken from the NCERT book. Read or maybe cram the whole of NCERT (chemistry especially). Most importantly, questions in inorganic chemistry are directly lifted lines from the NCERT.

15) Mind over heart: This happens with the most of us. We see a question in exam and our heart says that the answer is something whereas the mind says something else. Always, go with the mind. The IIT-JEE is meant to test 'intelligence' of over 5 lakh students, not to simply test if something new strikes you during the exam. So, let only the mind solve the questions and let the heart only keep up your spirit. The reverse leads to disaster!

16) Confidence: Whatever happens, this is the most important thing needed during the preparation and exam. Let your spirits always stay high. Remember this fact- " The person writing all this (Dhawal) had only confidence with him. His concepts were zero but still i managed to clear JEE because he believed in himself." And i am not being modest or anything. Neither am i thinking low of myself. I am simply saying the truth in your as well as my face. So, If i can.....anyone can!!
Moreover, never go to the exam centre with any book or anything. The only thing you should be carrying is your admit card and a pencil box with your stationery. And if you feel low while studying, here are some songs that will help lift you up. Put them in your cellphone/ipod and listen over on earphones. I believe it will help you.

42 comments:

Anonymous
said...

tht's the best write up tht any IIT aspirant could have read before 5 days of their JEE...I love ur blog...its really good.keep posting..i'll definitely remember the last paragraph if i feel like i don know anything in the paper on 10th...

Thankyou so much for this. Atlast finally its up before the exams. :)sorry had read it in morning through cell but wasn't able to leave comment. As the person above said, yes its a boosting post and on the same time telling me to re- think if i really wanna do this? Yes, yr. Engineering has been in my mind and soul since 5-6 years. Its has always been everything i wanted to be. And i'll pakka keep these points in mind. But hey, i haven't read ncert :-|

@anonymous: Thanks a lot..!! feels nice to know tht i helped somebody... and don't worry.. JEE is just another exam..nthng more..@deepika: well..there aint much that u can do regarding NCERT now... Good luck anyways..

@divya: by fortune, this is the post that's been generating max amount of hits... :P :P :P..and i just wrote this also to show how ignorant the administrators are while formulating the options for objective questions... How i wish some coaching institute hired me to teach such tricks!!! I'd have really boosted their results.. :P :P :P

I am from IIT BOMBAY.I am into the teaching industry for 20 years & it is very sad to see how students get into iit by using such pathetic techniques.By using such techniques u may get into iit but in reality u know nothing.This is the reason why none of the iits is ranked in top ten engineering institutes of the world.I have known some students who studied at mit[usa] and they said the students over there learn basics not use pathetic methods which u mentioned.It's my earnest request to u to not to mislead iit aspirants by your pathetic methods.By the way r u really an IIT'ian?

@toretto niranjan: Thats wat happens when you spend all the time doing nonsense. thanks for the praise. All the best dude for your JEE..!!@anonymous1: Well.. i never had in mind that I HAVE to clear JEE. IIT was a thng wich i always thot was beyond my ability and hence i never cared for it. But, if i managed to get "ELECTRICAL ENGINEERING" in an "IIT"(u must be knowing opening & closing ranks), That means i got a decent rank. Anyways,i know i deserve to be an iitian coz here i find myself better at a lot of stages than a lot of those ppl who slogged it out for JEE.

@anonymous no-2: Sir,(as u r into teaching for 20 yrs,so u r a lot elder to me!) I clearly stated at the end of my post that "Do engineering if only your heart wants to..."but,i'd also like to point out something else. Here, at iit, i hav seen tht my analytical thinking is a lot better than many better rankers.But there has been no encouragement to do something innovative. The profs think that we are some flukes none of whom has any brain. In short, I have been left disappointed,sir. The problem is our system sir. Everyone is too tired to let something new enter into it. Only 1 prof has ever acknowledged to us in class if he committed a conceptual mistake. Rest all just either declare it right of ignore it. I used to know a lot of things and a lot of interests but now..everything has decayed bereft of life..

@anonymous no-2: regarding the post, this was something that i got to learn by giving the entrance exams. Id someone actually wanted to test our knowledge, then also create options which test our knowledge. I am not encouraging the method which i used but i am criticising the ignorance of JEE administration. If you wish to filter the JEE tudents, first they should make the proper filter and get the subjective paper back for JEE. BTW,yes... i am an IITian. 3rd year,Electrical Engg.

Sorry for my harsh comments son.I know the system is to be blamed because the present system is erroneous.That's the reason why inspite iit jee being one of the toughest exam in the world,iit does not feature even among the top ten in the world. The real test was always subjective & it should be brought back.I know the teachers at iit do not except their their mistakes when their concepts go wrong which is very wrong.I my 20 years of teaching sometimes I made mistakes & my students corrected me.I felt very happy because I knew they were not taking studies for granted & except what anyone says because anyone can make mistakes after all we are human beings.I always try to learn knew things from my students & from u I have learnt the way of living for true happiness.My personal life was never happy & I had to take a lot of trouble to reach where I am.My parents were very poor & they could not afford to give me a decent education.I had to work to fund my studies & today I can afford to send my children abroad for studies.Do well in your life & god bless u son.

@anonymous: It's all right sir..maybe i also went a bit too far... But after a lot of fight i have realized that the only thng tht i can do abt the present system is lament. The next change wud happen only after my degree... Btw, its nice knowing you sir..! I'd like to have some advice from you regarding Industrial training from you..!! My email id is there on my blog page.. Hope i'd get a positive response..!

thx a lot bro......i tried really hard to carm up all the formulae bt keep on forgetting ......bt still i m in a hope tht i will do better tommorow...........thx once gain ....my best wishes for u Arjit..................

You have teached many of us the fact, that you can do anything if you really want by not giving up but going for your goal inch by inch! You have done a good job, and you have inspired me greatly by your example of how a man can get back up again when tragedy strikes hard run (or go) hell for leather this the big print giveth and the small print taketh away [url=http://lonajoq.uphero.com/brain-peer-review-suicide-teen.html]brain peer review suicide teen[/url]

Baat aisi hai...i wrote in very clear words..tht if you wanna do engineering for namesake..then don't do it... the ones having interest in it wont need the help of all these tricks..!! I am not boasting that I am 100%right in doing this.. but this is my way of showing how hollow the examining procedure is...And then to hide this hollowness in the exams, they try to blame the coachings and all just because they managed to catch them by their weakness. The basic fact lies tht the admin shud make the questions good..!! I would very happily like to get into the JEE board and help in making intelligent options and nullify my advices.. But no one's gonna listen to that..!! So, this is my way of proving how hollow the so-called esteemed administrations are... Brain ke saath saath thoda bahut mind toh test kar lo bachhe ka..!!! And then they themselves claim tht maggus are entering IIT..And, i dun wanna get into coaching vs school debate..!! The schools never stress towards engineering perspective and thats why the boards toppers never manage to find their names at the top of JEE merit lists... and the ones that manage to do so are the ones belonging to those schools which even classify students on the basis of the coaching inst that they have joined.

u forgot a trick ... for comprehension type question... e.g. there are 3 q. on finding time , speed , distance...put values of time 1 by 1... and find value of speed frm it... at least for 2 options value of speed is not in any of the choices and are thus ruled out....Arjit Saraswat

man, i respect ur views... but i have REVERSED ENGINEERED the most imp. topics of d jee syllabus.ur write up is gr8 but a true iit aspirant must have found out all these tricks in d 1st week of their prepn.actually ur tricks in the first part are actually not tricks, but a way to gain negative marks happily. i have got more tricks dan u under my hood...bt i'll disclose dem after i crack d jee.

I am a jee aspirant who'll take the exam in 2014. Personally, I feel some of these do not work all the time, especially the majority/minority, extreme value one. In any case, it'll be foolish to try them if you can solve the question properly. But the rest of the tricks, I.e. putting values and dimensional analysis etc are not only used by most of us, but I personally believe that these questions are deliberately inserted in the paper to test the smartness of canditates. The exam is meant to test how many questions you can solve correctly in a given time, method used is irrelevant, even if you do tukkebaazi. :-P personally, its great you got selected and I'm very happy for you. However I refuse to believe you did not study properly. You yourself mentioned that they got you around 30 marks. I'm sure you need more than that for selection. Anyway, cheers and best wishes all around. May I excel next year. Peace.

I really enjoyed reading your article. I found this as an informative and interesting post, so i think it is very useful and knowledgeable. I would like to thank you for the effort you have made in writing this article.

Hi.. I am Raji. I am going to attend the IIT JEE examination after two years. I started my preparation before two years of the examination. I feel very difficult to solve the mathematical questions.I have planned to join IIT Coaching institutes From this post, I know some techniques to solve the question within a time.

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so ....this is dhawal...
so here is a simple,sweet,shy,innocent,dumbo, intelligent,honest,true,high iq,gud at heart kinda guy from the heart of delhi who prefers to live life simple n sweet types!! enjoy hanging ut wit frnz n value thm if they r tru ones.
found it boring?????
u r free to move on to othr profile....
dun waste more of ur time on me!
bye